Ground-breaking device



aD. ERIER.

GROUND BREAKING DuEvlcL y APPLICATlaN ElLEDHMRJzs, 1915; 1,319,951. IPmnted oct. 28,1919.

2 SHEETS-SHEET 2.

UNITED STATES PATENT FFIQE.

DAVID ERT'ER, OF SPRINGFIELD, OHIO.

GROUND-:BREAKING- DEVICE.

Specification of Letters Patent.

Patented Get. 28, 1919.

` .Application filed March 25, 1915. Serial No. 17,006.'

` of which the following is a specification.

This invention relates to ground break- ,ine devices and moreparticularly to de- 25 f vices which areV adapted to be attached to aroad roller to permit the lattervto act as a scarifier.

One'of the objects of the invention is to lprovide a mechanism of this'classwhich may vbe'readily attached to a road roller. in

the field so as to avoid-taking the machine out of service and sendingit to a factory to have the attachments added thereto.

Another object of the invention is to provideV apparatus of the classdescribed which will be adapted to break up oiled roads, the surface ofwhich has become so caked that ordinary scarifying machines cannot beused on account of becoming clogged.

A further object is to provide an improved form of'cushioning mechanismfor the scarifying apparatus, which will be capable of withstanding thesevere service to which it is subjected.

With the foregoing and other objects in view, as will appear from thefollowingdescription, the invention may be embodied in various forms ofapparatus, some of which are illustrated inv the accompanying drawings.j

In the drawings Figure ,1 is a side elevation of the rear portion of-aroad roller, having one form of my invention applied thereto Fig. 2 is arear'elevation of the same;

Fig. 3 is a view similar to Fig. 1 showing another form of theinvention; Fig. 4 is a rear elevation of the mechanism shown in Fig. 3.-

Referring to the drawings, the rear wheels of a road roller are shown at10 and the usual tank, at the rear of the machine, is

indicated at 11. The usual draw-bar with which road machines areordinarily equipped is indicated at 12, this draw-bar being rigidlysecured to the rear of the tank 11.

In accordance with my invention, brackets 13 and 14 are secured to thedraw-bar 12 and rotatably support a horizontal shaft 15. The shaft 15has keyed thereontwo sets of alternately arranged arms 16 and 17 Az;shown inFig. 1 the arms 17 are shorter 'than the arms 16 and areinclined at a greater angle so that the digging spikes 1S carried bythearms will be arranged in stag'- gered relation. The spikes 18 aresecured to the arms by having theends of the latter split, as indicatedin Fig. 2 and clamped by means of bolts 19. An upwardly projecting arm2O is keyed to the shaft 15 land has pivotally connected with the upperend thereof a link 21 which is also pivotally connected with downwardlyprojecting lugs 22 on va cylinder The cylinder is slidably supported onthe stationary tubular piston rod 24 which has secured thereon astationary piston 25. The rod 24 is supported -in brackets 26 and 27which are secured to i the tank 11. The brackets 26 and 27 also vsupportguide rods 28 and 29 arranged on opposite sides ol' the cylinder' andengaged by oppositely projecting lugs 30 on the cylinder.` A controlvalve 31 of any suitable form, such as .an ordinary four-way cock, 1sconnected with the opposite ends of the'rod 24 by pipes 32 and 33, asclearly shown in Fig. 1. f The valve 31 is indicated more or lessdiagrammatically anda supply pipe 34 is shown as being connected withthe underside thereof. The usual eX- haust pipe is indicated at 35. Therod 24 is preferably in two parts connected with the opposite sides ofthe piston 25 and provided with perforationsBG for the passage ofapressure iuidfor. actuating the cylinder 23.

As shown in Fig5 1, the-parts arein the position in which the spikes18`dig up the ground. The cylinder 23 is held in the position shown bythe pressure fluid which is admitted to the space on Athe lefthand sideof the piston by the val've 31.

As the machine moves forward the spikes tear up the ground and, onvaccount of the staggered relation of the spikes, and the spaces betweenthe arms 16 and 17 there will'be little or no clogging when an oiledroad is dug up. In digging up an oiled road the surface is usually socaked that it comes up in the form `of a sheet and this sheet will bebroken up by the arms 16 and 17. When any of the spikes strikes an'mmovable obstruction, the spikes will e lifted high enough to permitthem to pass over the obstruction, the cylinder 23 moving to the right asufficient distance to accommodate the necessary lifting. of the spikes.The cylinder 23 thus acts a cushioning device and as soon as theobstruction has been passed over the pressure will move the cylindertoward the left and force the spikes into the .ground again. It will beobserved that the parts are so arranged that the force eX- erted on thespikes will be substantially uniform irrespective of the depth ofpenetration into the ground. v

Refeiring now to Figs. 3 and 4, it will be seen that the shaft 15 andarms 16 and 17 and the digging spikes 18 are the same as in F igs.-1 and2. In this form of the invention, however, the arm 20 .carries aquadrant 3T which is provided with the gear teeth 36. The teeth38 arearranged concentric with the axis of the shaft 15 and mesh with theteeth of a pinion 39 on a shaft 40. The shaft 40 is supported inbearingbrackets41 which are secured to a suitable frame 42 on the sideof the tank 11. rlhe shaft 40` also carries a gear wheel 43 which mesheswith a pinion 44 on the crank shaft 45 of an oscillatingengine 46. Theengine 46 may be of any preferred construction and since it is a connnonarticle of trade it is only shown diagrammatically in the drawings. Theengine 46 is provided with the usual supply and exhaust pipes 47 for themotive fluid and when the spikes 1S are in the ground the pressure ofthe motive fluid tends to rotate the shaft 44 in the direction to forcethe spikes into the ground so that when the spikes meet an immovableobstruction the movement ofthe quadrant 37 will rotate the shaft inopposition to the pressure fluid so that the engine 46 will act as acushioning device and restore the spikes to their normal depth ofpenetration as soon as the obstruction has been passed.

lt will be seen that in both forms ofthe invention shown the parts whichare attached to theroad machine are of such a simple nature that thework of securing the parts to the machine, being also of a simplenature, may be done in the field and without making it necessary to sendthe machine to a factory for that purpose. lt will also be seen that thesimplicity of the mechanism lwill make .it durable and eflicient inoperation and, since the parts are attached to the rear of the machineand the arms 16 and 17 have a rocking movement, the machine itself willnot be subjected to an excessive amount of jarring and jolting.

Having described the invention what' is claimed is: y

1. The combination witha road machine, a shaft attached to the rearthereof, a

groundbreaking device non-rotatively ating breaking points pivotallymounted at the rear of said member, alternate arms being of differentlengths and having dierent angular positions on said shaft wherebyadjacent breaking points will be in different lines transversely of themachine, a cushion-ing device attached to the side of said member, andmeans operatively connecting said ground breaking device and cushioningdevice.

3. The combination with a road machine, of a horizontally arranged rockshaft attached to the rear thereof, arms secured on said shaft andspaced apart laterally thereon, separate ground-breaking devices carriedby each of said arms, an upwardly projecting arm secured` on said shaft,a cylinder'l slidingly mounted substantially over said shaft and havinga downwardly projecting lug, a link connecting said lug and arm, astationary piston in said cylinder, and means for supplying a pressurefluid to said cylinder on opposite sides of said piston.

In testimony whereof aiixmy signature.

navin narnia.

